Would you say that hitting someone who taunts you with name-calling can be moral self-defense or would it be excessive self-defense in violation of the NAP?
If you don't subscribe to the NAP then I don't think this question is for you. By "free society" I mean an an-cap society in which the NAP and property rights are the only rules.
I don't think blackmail is aggression because it's just talking and deal-making. Aggression is when you physically attack someone or violate someone's property rights. I think fraud is also a violation of property rights.
Blackmail is basically an agreement to keep a secret in exchange for money. If the blackmailer accepts money and then reveals the secret, then he is committing fraud. Otherwise, I don't see how he is doing anything immoral.
I disagree with your premise. I don't want to frame blackmail as non-aggression. It's like asking me why I'm gay. I'm not gay, so I can't answer that question.
If you're asking why I'm asking about blackmail in the first place, it's because blackmail is an issue that seems to be mitigated by law in a state, but I don't see how blackmail could be stopped in an an-cap society because it doesn't violate the NAP.
You lost me. Maybe I'm the dummy here, but nothing of what you said made any sense to me. Were you smoking some green marijuana when you made that post?